Critical · published June 20, 2025
🚨 An authenticated user can effectively rewrite your filesystem with a simple archive upload! This vulnerability in Mattermost could lead to devastating remote code execution. 🔥 Think of it like a sneaky delivery service that accepts poorly labeled packages — if you send a parcel that looks legitimate but comes with hidden instructions to be delivered all over your house, chaos ensues! With this vulnerability, an attacker could upload specially crafted archives that write files anywhere on your server. This could lead to total control over your application, allowing the attacker to execute arbitrary code and gain access to sensitive data. The consequences could be absolutely devastating!
Think of it like a sneaky delivery service that accepts poorly labeled packages — if you send a parcel that looks legitimate but comes with hidden instructions to be delivered all over your house, chaos ensues! This vulnerability is due to the failure to sanitize filenames in the archive extractor, allowing authenticated users to exploit path traversal sequences in their uploaded files. When file uploads and document content search are enabled, it opens the door for remote code execution.
With this vulnerability, an attacker could upload specially crafted archives that write files anywhere on your server. This could lead to total control over your application, allowing the attacker to execute arbitrary code and gain access to sensitive data. The consequences could be absolutely devastating! To mitigate this risk, immediately update to Mattermost versions 10.5.6, 9.11.16, 10.8.1, 10.7.3, or 10.6.6. Additionally, consider disabling file attachments and content extraction features until you can ensure proper sanitization of uploaded files. 🛡️ You've got this! Follow these steps and you’ll be locking down your Mattermost instance in no time! 💪✨